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Why the Sky is Blue
Description
Sunlight is composed of all the colors of the rainbow, traveling as waves of varying lengths. When this light strikes gas molecules in the atmosphere, blue light—which is characterized by shorter wavelengths—scatters in every direction more effectively than the other colors. This phenomenon, known as "Rayleigh scattering," is what causes the sky to appear blue to our eyes during the day.
Original title
למה השמיים כחולים?
אור השמש מורכב מכל צבעי הקשת, הנעים כגלים באורכי גל שונים. כאשר האור פוגע במולקולות הגז באטמוספרה, הצבע הכחול, שמתאפיין בגלים קצרים, מתפזר לכל העברים ביעילות רבה יותר משאר הצבעים. תופעה זו, המכונה "פיזור ריילי", היא שגורמת לשמיים להיראות כחולים לעינינו במהלך היום.
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